 function show() {
     console.log('show----');
     return 1;
 }

 function sum(a, b) {
     console.log('sum-----');
     return a + b
 }

 class Person {
     constructor(name, age) {
         this.name = name
         this.age = age;
     }
     showName() {
         return `我的名字是:${this.name}，我有${this.age}岁了`
     }
 }

 const a = 'aaa1'
 const b = 'bbb2'
 export {
     a,
     b,
     show,
     sum
 }

 export default { Person }